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diff --git a/pjlib/include/pj/ip_helper.h b/pjlib/include/pj/ip_helper.h
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+/* $Id: ip_helper.h 3553 2011-05-05 06:14:19Z nanang $ */
+/* 
+ * Copyright (C) 2008-2011 Teluu Inc. (http://www.teluu.com)
+ * Copyright (C) 2003-2008 Benny Prijono <benny@prijono.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA 
+ */
+#ifndef __PJ_IP_ROUTE_H__
+#define __PJ_IP_ROUTE_H__
+
+/**
+ * @file ip_helper.h
+ * @brief IP helper API
+ */
+
+#include <pj/sock.h>
+
+PJ_BEGIN_DECL
+
+/**
+ * @defgroup pj_ip_helper IP Interface and Routing Helper
+ * @ingroup PJ_IO
+ * @{
+ *
+ * This module provides functions to query local host's IP interface and 
+ * routing table.
+ */
+
+/**
+ * This structure describes IP routing entry.
+ */
+typedef union pj_ip_route_entry
+{
+    /** IP routing entry for IP version 4 routing */
+    struct
+    {
+	pj_in_addr	if_addr;    /**< Local interface IP address.	*/
+	pj_in_addr	dst_addr;   /**< Destination IP address.	*/
+	pj_in_addr	mask;	    /**< Destination mask.		*/
+    } ipv4;
+} pj_ip_route_entry;
+
+
+/**
+ * Enumerate the local IP interfaces currently active in the host.
+ *
+ * @param af	    Family of the address to be retrieved. Application
+ *		    may specify pj_AF_UNSPEC() to retrieve all addresses,
+ *		    or pj_AF_INET() or pj_AF_INET6() to retrieve interfaces
+ *		    with specific address family.
+ * @param count	    On input, specify the number of entries. On output,
+ *		    it will be filled with the actual number of entries.
+ * @param ifs	    Array of socket addresses, which address part will
+ *		    be filled with the interface address. The address
+ *		    family part will be initialized with the address
+ *		    family of the IP address.
+ *
+ * @return	    PJ_SUCCESS on success, or the appropriate error code.
+ */
+PJ_DECL(pj_status_t) pj_enum_ip_interface(int af,
+					  unsigned *count,
+					  pj_sockaddr ifs[]);
+
+
+/**
+ * Enumerate the IP routing table for this host.
+ *
+ * @param count	    On input, specify the number of routes entries. On output,
+ *		    it will be filled with the actual number of route entries.
+ * @param routes    Array of IP routing entries.
+ *
+ * @return	    PJ_SUCCESS on success, or the appropriate error code.
+ */
+PJ_DECL(pj_status_t) pj_enum_ip_route(unsigned *count,
+				      pj_ip_route_entry routes[]);
+
+
+
+/** @} */
+
+PJ_END_DECL
+
+
+#endif	/* __PJ_IP_ROUTE_H__ */
+